如图所示电路中,L为电感线圈,电阻不计,A、B为两灯泡,则 [ ] A.合上S时

题型:选择题

问题:

如图所示电路中,L为电感线圈,电阻不计,A、B为两灯泡,则

[ ]

A.合上S时,A先亮,B后亮

B.合上S时,B先亮,A后亮

C.断开S时,A立即熄灭,B亮一下再熄灭

D.断开S时,A、 B同时熄灭

考点:自感现象
题型:选择题

患者男,58岁。疲乏无力,骨痛,反应迟缓,视力减退。实验室检查结果显示正细胞正色素性贫血,血沉45mm/h,尿蛋白阳性,骨髓检查原始浆细胞15%。

该患者外周血涂片可查见的特征性细胞是 ()

A.靶形红细胞

B.口形红细胞

C.球形红细胞

D.缗钱红细胞

E.镰形红细胞

题型:选择题

有清热息风,通络之效的息风止痉药是()。

A.牛黄

B.白花蛇

C.僵蚕

D.全蝎

E.地龙

题型:选择题

阅读理解。

     Worrying about how you'll perform on a math test may actually contribute to a lower test score, US

researchers said on Saturday.

      Math anxiety-feelings of dread and fear and avoiding math-can weaken the brain's limited amount of

working capacity, a resource needed to calculate difficult math problems, said Mark Ashcrafi, a psychologist

at the University of Nevada Las Vegas who studies the problem.

     "It turns out that math anxiety occupies a person's working memory," said Ashcraft, who spoke at the

annual meeting of the American Association for the Advancement of Science in San Francisco.

     Ashcraft said while easy math tasks such as addition require only a small part of a person's working

memory, harder calculations require much more.

      Worrying about math takes up a large part of a person's working memory stores as well, spelling disaster

for the anxious student who is taking a high-stakes test ( 高风险测验).

     Stress about how one does on tests like college entrance exams can make even good math students choke.

"All of a sudden they start looking for the short cuts," said University of Chicago researcher Sian Beilock.

     Although test preparation classes can help students get over this anxiety, they are limited to students whose

families can afford them.

     Finally, she said, "It may not be wise to rely completely on scores to predict who will succeed."

     While the causes of math anxiety are unknown, Ashcraft said,"People who manage to get over math

anxiety have completely normal math ability."

1. Sian Beilock points out that stress________.

A. can't be avoided before college entrance exams

B. contributes to scores in college entrance exams

C. has no effects on good math students

D. has side effects on students in college entrance exams

2. What does the underlined word "spelling" probably mean?

A. causing

B. reducing

C. taking away

D. preparing for

3. What can we learn from the text?

A. The causes of math anxiety have already been found.

B. All of the students attend test preparation classes.

C. Math anxiety weakens working memory needed to do math.

D. Few measures can be taken to get rid of math anxiety.

4. What does the passage suggest middle school students do before exams?

A. Get relieved.

B. Review lessons.

C. Go to the doctor's.

D. Rely on scores.

题型:选择题

患者,男,60岁,胃溃疡病史3年,1年来上腹痛发作频繁,无规律,体重减轻。

患者拒绝手术治疗,自行回家,6个月后出现呕吐,吐宿食,不含胆汁。CT检查示:“肝内多个圆形低密度灶”,此时的TNM分期为

A.Ⅱ

B.Ⅰb期

C.Ⅳb期

D.Ⅴ期

E.Ⅲa期

题型:选择题

Access中,以下哪个不属于查询操作方式( )。

A.选择查询

B.参数查询

C.准则查询

D.操作查询

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